Call method without parameters

[BuilovAlexey]

I want call method from server

        [JsonRpcMethod] 
        public string GetWindowsUserName()
        {
            return System.Environment.UserName;
        }

I use https://github.com/Astn/JSON-RPC.NET framework for server.

In client i need call method without parameters:

        Json::Value params;
        params = Json::Value::null;
        Value methodResult = clientNew.CallMethod("GetWindowsUserName", params);

but i get
Exception -32602 : INVALID_PARAMS: Invalid method parameters (invalid name and/or type) recognised: Invalid params, data: "The number of parameters could not be counted"
With use "params = Json::nullValue" i get same result.
How i can to call method without parameters?

P.s. when i call method with parameters I get normal result.

[cinemast]

Sounds to me like an error on the side of JSON-RPC.NET. If there are no parameters passed, the params field can be ommited. It is also in the JSON-RPC specification: http://www.jsonrpc.org/specification

You should raise an issue at JSON-RPC.NEt about this.

[BuilovAlexey]

ok, but if server will by libjson-rpc-cpp server, what i must to do, to call method without parameters?
Will my example work? or what value must have "params", if method "GetWindowsUserName" haven't parameters?

  Json::Value params;
  params = Json::Value::null;
  Value methodResult = clientNew.CallMethod("GetWindowsUserName", params);

[BuilovAlexey]

A try call method without parameters:

    Json::Value params;
    params = Json::Value::null;
    HttpClient httpClient("http://localhost:3333/");
    Client clientNew(httpClient);
    Value methodResult = clientNew.CallMethod("GetWindowsUserName", params);

In server i get this request message:
{"id":1,"jsonrpc":"2.0","method":"GetWindowUserName"}
And whis request can't parse JSON-RPC.NET lib.
i find here http://support.mashery.com/docs/read/mashery_api/20/JSON_RPC example without parameters. in this case json request:
{ "jsonrpc": "2.0", "method": "test.hello", "params": [], "id": 1 }
but i think it's incorrect example....

I test this case:

httpClient.SendRPCMessage("{\"jsonrpc\":\"2.0\",\"method\":\"GetWindowsUserName\",\"params\":[],\"id\":1}",methodResult);

and get normal response with result of this method.

but, in here http://www.jsonrpc.org/specification i find this example:

a Notification:
--> {"jsonrpc": "2.0", "method": "update", "params": [1,2,3,4,5]}
--> {"jsonrpc": "2.0", "method": "foobar"}
rpc call of non-existent method:
--> {"jsonrpc": "2.0", "method": "foobar", "id": "1"}

hm... okey i think i need fix fix and rebuild .net json rpc project... fix to parse message when params has no value.

[cinemast]

Yes, it is an error in the JSON-RPC.NET framework. You really should raise an issue there with your findings and reference this issue here.

[BuilovAlexey]

JSON-RPC.NET last commit was half year ago.. and author don't answer to users by last some issues. okey may be i will raise issue, but i haven't time for wait bug fix.

[BuilovAlexey]

omg... they fix this bug in one of the last commits, but don't refresh nuget package...